British number two Heather Watson has said that recent illness held her back after she was knocked out of Wimbledon by American Madison Keys.
Watson, who suffered from glandular fever earlier this year, said:
I feel like my game isn't back yet.
I don't think I served well today. I didn't have a high first-serve percentage.
My reactions are slow. I'm not moving like I usually move, getting balls back.
I don't feel like my game's there yet, so that will come back with time.
I knew going in it was going to be a tough one - and it was.
British number two Heather Watson has crashed out of Wimbledon after losing to American Madison Keys.
The 18-year-old rising star beat the British hopeful 6-3, 7-5 to reach the second round of the tournament.
Heather Watson was knocked out of the French Open in the first round by Switzerland's Stefanie Voegele.
The British number two lost 6-4, 2-6, 6-4 at Roland Garros.
Heather Watson is proud that her hard graft has paid off as she becomes the first Briton to win a WTA Tour singles title in 24 years.Read the full story ›
Britain's Heather Watson has beaten Chang Kai-Chen (Taiwan) 7-5 5-7 7-6(4) in the Japan Open Women's Singles Final.
Heather became the first Briton to win a WTA Tour singles title in 24 years by winning a marathon match.
She beat Kai-chen of Chinese Taipei in the final of the HP Open in Osaka.
The 20-year-old from Guernsey looked to have thrown her way her chance of victory.
Having served for the match at 5-3 in the second set, she fell a break down and faced match point in the decider.
But she broke back before finally clinching a win in three hours 11 minutes.
Watson has followed in the footsteps of Sara Gomer, the last British winner of a singles title on the WTA Tour in California in 1988.
This is my first WTA title so I'm really happy right now. It's such a nice feeling getting to the end of the week and being the last ones here. We knew it wasn't going to be an easy match today - they're both great players and we knew we would really have to win it, they weren't going to give it to us.
Laura Robson has congratulated Heather Watson and Marina Erakovic after they were crowned Bank of the West Classic champions. Robson and Watson will play together as Team GB's womens doubles team in the Olympics.
Heather Watson's Olympic preparations took another boost last night as the 20 year-old claimed her first WTA Tour doubles title.
The British number 1 and partner Marina Erakovic beat top seeds Vania King and Jarmila Gajdosova in straight sets in the final of the Bank of the West Classic.
Watson and her partner from New Zealand had already beaten the second and third seeds on their way to the final, where they came out 7-5 7-6 (9/7) winners against players ranked seventh and 37th in the world.
She will now turn her attention to the Mercury Insurance Open in California next week, before being partnered by Laura Robson as one half of Team GB's Olympic womens tennis doubles team.
Heather Watson has become the first British female to enter the third round of Wimbledon in a decade. She beat USA's Jamie Lee Hampton 6-1, 6-4.
Great Britain's Heather Watson is leading against USA's Jamie Lee Hampton one set to nil at Wimbledon.
Heather Watson is doing great, taken the first set and looks rock solid with a break in second #Wimbledon
Out on Court 2 watching Heather Watson who is on course to be the first British woman into round 3 at Wimbeldon for 10yrs. Watson leads 4-0
Heather Watson breezes through the first set v Jamie Hampton 6-1, bidding to be first Brit woman into 3rd round since Baltacha 2002